Ride a bunch and don't worry about it. Even at 6'5" and ~200, you'll still feel like a lard ass after watching some dudes built like Kate Moss fly by you on the climbs.
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"...in Las Vegas where -the electric bills are staggering -the decor hog wild -and the entertainment saccharine -what a golden age -what a time of right and reason -the consumer's king -and unhappiness is treason..."